If disclosure was about to be announced, would governments around the world, quietly prepare the public in advance?

I ask this question, because here in the UK, the government have just released “advice” to the public to stock up on general supplies, enough for 3 days. They are suggesting things like torches, basic food, medical supplies and water. This is in case of emergencies like flooding, power cuts, food shortages etc. Of course this has got some members of the population panicking as why they would issue this. My wife in particular has been querying it, worrying that maybe the government know something we don’t know. I pointed out that it’s probably just basic advice and makes sense to have some stocks, Covid being an example where people went mad over toilet roll, here in the UK. But as I re-assured my wife it wouldn’t be something like nuclear war, because 3 days is nowhere near enough to cover the fallout from that, it has to be a short-term problem where people might panic buy. That’s when I jokingly said to her “maybe it’s all the news about disclosure supposedly happening” and laughed. But then it got me thinking. If disclosure was about to happen, are governments likely to just ‘drop’ that bombshell news in a rushed press conference? Surely they would build up to it slowly? 3 days of supplies actually sounds about right if they announced it, as some would panic, go rushing to the shops and hoard everything, until the news settled in and calm was restored. I’m not saying the advice from the UK is that, but maybe if disclosure was coming, it would likely be little signs like this cropping up before they dropped the news. Keen to see what others think. Cheers